Bi-Hex Bolts Screws are manufactured by Lakshman Tools Pvt. Ltd. Lakshman Tools Pvt. Ltd. Is an ISO 9001:2000 accredited company that manufactures high tensile steel fasteners suitable for applications in all types of industries and automobile companies. The fastener products are sold under the brand name of " RHINO" . Strength Designation Class/Grade of Bi-Hex Bolts Screws is 12.9. Material used in the manufacturing of Bi-Hex Bolts Screws are Black Phosphate Heat Treated Alloy Steel. These Bolt Screws find application in the making of Engines.